package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("登录过滤器");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestUrl = request.getRequestURI();
        log.info("拦截到请求", requestUrl);

        //配置需要放行的路径
        String[] loginUrls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //判断url是否匹配需要放行的路径
        boolean checkResult = check(loginUrls, requestUrl);
        if (checkResult) {
            filterChain.doFilter(request, response);
            return;
        }
        if (request.getSession().getAttribute("employee") != null) {
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


        return;
    }

    //匹配是否放行路径的check方法
    public boolean check(String[] loginUrls, String requestUrl) {
        for (String loginUrl : loginUrls) {
            boolean flag = PATH_MATCHER.match(loginUrl, requestUrl);
            if (flag) {
                return true;
            }
        }
        return false;
    }
}
